A Study on hydrogen dispersion characteristics according to the length of the exhaust duct in the fuel gas supply system room
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Hydrogen has wide-ranging flammability, lower minimum ignition energy, and higher flame propagation speed than hydrocarbon-based fuels. If a leak accident occurs on a ship that uses hydrogen as fuel, there is a high possibility that it will lead to an explosion or fire. A confined space, such as a fuel-gas supply system room on a ship, should be provided with effective mechanical ventilation systems to prevent the accumulation of hydrogen. An exhaust duct must also be installed to prevent the discharged gas from spreading to hazardous areas. In this study, the dispersion characteristics of hydrogen according to the length of the exhaust duct in a fuel–gas supply system were numerically investigated. The FLACS program was used for numerical analysis, and the numerical analysis technique was compared and verified with the experimental results. Numerical analysis confirmed that the exhaust duct length affected the dispersion characteristics inside the fuel gas supply system room. The numerical analysis results of this study are expected to be useful in the design and installation of ventilation systems and exhaust ducts.
Abstract
Hydrogen has wide-ranging flammability, lower minimum ignition energy, and higher flame propagation speed than hydrocarbon-based fuels. If a leak accident occurs on a ship that uses hydrogen as fuel, there is a high possibility that it will lead to an explosion or fire. A confined space, such as a fuel-gas supply system room on a ship, should be provided with effective mechanical ventilation systems to prevent the accumulation of hydrogen. An exhaust duct must also be installed to prevent the discharged gas from spreading to hazardous areas. In this study, the dispersion characteristics of hydrogen according to the length of the exhaust duct in a fuel–gas supply system were numerically investigated. The FLACS program was used for numerical analysis, and the numerical analysis technique was compared and verified with the experimental results. Numerical analysis confirmed that the exhaust duct length affected the dispersion characteristics inside the fuel gas supply system room. The numerical analysis results of this study are expected to be useful in the design and installation of ventilation systems and exhaust ducts.
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